It doesn't do you much good unless you want to be real adventurous, but in Perl 5.10 (available as a beta download on ActiveState) you'll be able to say:

use warnings;
use strict;
use 5.010;

use Term::UI;
use Term::ReadLine;

my $term = Term::ReadLine->new();
my $filename = $term->get_reply(
    prompt => "Where is the file? ",
    default => "C:/Data/toload.txt",
);

say "Filename: $filename";
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The beta is available for Windows, but whether to use it or not is completely up to you.

Other than say, which is easily replaced by print, why does that need 5.10?

Term::UI is listed as part of Core for 5.10, that's all. I just now had the silly realization that it could just be installed from CPAN as well.

Is this meant to be run from the command line in a console window, or over a web page? If it's the console, why not just prompt the user for input by showing the default value that will be accepted with a CR ? Is it that there may be a really long path to type in, and you want to save the user some keystrokes? I suppose I don't understand the need to provide an editable prompt, even though it does sound kind of cool.

I want to prompt the user for the path of a file but I would like to give him a default editable value, for example I give him C:/Data/toload.txt as a default value(...)just changing the name of the file for example, without having to re-type the whole thing...

For that you can use something like

print 'type your path [c:\data\toload.txt]: ';
chomp (my $inputFile = <STDIN>);
$inputFile ||= 'c:\data\toload.txt';
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and he can modify it directly,

Well, that might need some Win32::Console-fu. The question is whether this is going to save any time; the user will still need to backspace it and type in something. Tab completion might help here, but I've no idea what gives you that on Win32.